Mark Tatara, MD
NPI 1043256324 · Internal Medicine Physician · Downers Grove, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Tatara, MD is a Internal Medicine Physician provider in Downers Grove, IL (NPI 1043256324).
Provider details
- NPI number
- 1043256324
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036-077438 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
2,076 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 635 | $131 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 437 | $17 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 252 | $131 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 221 | $9 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 119 | $186 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 137 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 736 | 217 |
| Amlodipine Besylate | 414 | 127 |
| Lisinopril | 339 | 92 |
| Metformin Hcl | 300 | 85 |
| Levothyroxine Sodium | 295 | 79 |
| Hydrochlorothiazide | 278 | 85 |
| Metoprolol Succinate |
Practice location
Mailing address
Additional practice locations (1)
- 7900 W Jefferson BlvdSuite 201Fort Wayne, IN 46804-4128Phone: (260) 432-2297Fax: (260) 969-7266
Registry dates
- Enumerated
- 2006-06-22
- Last updated
- 2021-12-23
- Certified
- 2021-12-23
Frequently asked questions
- What is Mark Tatara's NPI number?
- Mark Tatara's National Provider Identifier (NPI) is 1043256324, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Tatara's specialty?
- Mark Tatara is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Tatara located?
- Mark Tatara's practice location on file with NPPES is 6840 Main St Ste 200, Downers Grove, IL 60516.
- What is Mark Tatara's phone number?
- The practice phone number listed in the NPPES registry for Mark Tatara is (630) 869-5382.
- Does Mark Tatara accept Medicare?
- Mark Tatara is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Tatara's NPI active?
- Yes — Mark Tatara's NPI (1043256324) is active in the NPPES registry as of the last update on 2021-12-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.